America's has been laid bare in a national poll that shows huge chunks of the country believe in conspiracy theories about safe shots. One-quarter of adults said they believe the measles, mumps and rubella (MMR) vaccine causes autism – a widely studied and discredited claim that emerged in the 1990s.The Kaiser Family Foundation (KFF) poll also found that a third of adults believe that the Covid shots caused thousands of sudden deaths in otherwise healthy people.
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